Two lines that intersect to form four right angles
- Two lines that intersect to form four congruent right angles
- Two coplanar lines that intersect to form four right angles
- Two distinct coplanar lines that intersect to form four right angles
- Two perpendicular lines intersect to form four right angles
- If two lines intersect to form four right angles
- If two lines intersect to form four right angles the lines are called
- If two lines intersect then they form four right angles